<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Upload Test</title>
</head>
<body>
    <div>
        <input type="file" name='file' onchange="upLoadFile(this);"/>
    </div>
    <div>
        <pre id="ret-content"></pre>
    </div>
    <script>
        function upLoadFile(t){
            if(t.files.length<=0) return;
            let fm = new FormData();
            fm.append('file',t.files[0]);
            fetch("/upload",{
                method:'POST',
                body:fm
            })
            .then(async res=>{
                if(res.ok){
                    return res.text();
                }
                throw new Error(`${res.status} ${res.statusText}`)
            })
            .then(text=>{
                 let d=document.getElementById('ret-content');
                 d.innerHTML = `<img src="/image/${text}" style="width:80%;height:auto;">`;
            })
            .catch(err=>{
                console.error(err.message)
            });
        }
    </script>
</body>
</html>